I have done a few upgrades to XenServer 7.1 with no issue. But, recently I ran into an issue where I upgraded the XenServer pool and all of the storage repositories reported that only 2 of 4 paths were connected.
All hotfixes and patches were installed, and the SAN was configured as it had been with no changes and the configuration verified. I ended up calling Citrix as I was not sure where this was coming from. Citrix support started to manually change settings via the command line and I wasn't completely satisfied why it needed to be changed, especially since this hasn't happened to any of the upgrades prior. I decided to end the call and continue troubleshooting on my own, thankfully I did.
In trying to reverse the changes by Citrix (no offense), I was able to resolve the issue. Ultimately, I disabled multi-path on each of the servers, then re-enabled multi-path. And that was it, no manual manipulation files via the console in XenCenter, easy, quick and painless.
Applicable Products
XenServer 6.5
XenServer 7.1
Symptoms
After upgrading XenServer to 7.1.1 and you have multipath enabled, you may see a red x on your SR (storage repository) and under multi-path, it states only 2 or 4 paths.
Solution
For each XenServer host, enable maintenance mode, and disable then enable multi-path.